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  1. using System;
  2.  
  3. // Program.cs
  4. namespace Calculator
  5. {
  6.     public class Program
  7.     {
  8.         static void Main(string[] args)
  9.         {
  10.             Application app = new Application();
  11.             app.Run();
  12.         }
  13.     }
  14. }
  15.  
  16. // Application.cs
  17. namespace Calculator
  18. {
  19.     public class Application
  20.     {
  21.         private const string AppTitle = "Mini Calculator";
  22.  
  23.         public void Run()
  24.         {
  25.             Console.Title = AppTitle;
  26.  
  27.             Console.WriteLine("###############");
  28.             Console.WriteLine(AppTitle);
  29.             Console.WriteLine("###############\n");
  30.  
  31.             string s;
  32.  
  33.             do
  34.             {
  35.                 var userInputs = Input();
  36.                 var result = Calculate(userInputs);
  37.                 OutputResult(result);
  38.  
  39.                 Console.WriteLine("Do you like to solve another arithmetical problem? (y/n)");
  40.                 s = Console.ReadLine().Trim().ToLower();
  41.             } while (s.StartsWith("y"));
  42.  
  43.             Console.WriteLine("\nPress any key to exit...");
  44.             Console.ReadKey();
  45.         }
  46.  
  47.         public class UserInputs
  48.         {
  49.              public double Number1 { get; set; }
  50.              public double Number2 { get; set; }
  51.              public int Operator { get; set; }
  52.         }
  53.  
  54.         public static UserInputs Input()
  55.         {
  56.             Console.WriteLine("Please enter your first number: ");
  57.             double number1 = double.Parse(Console.ReadLine());
  58.             Console.WriteLine($"You chose: {number1}");
  59.  
  60.             Console.WriteLine("Please enter your second number: ");
  61.             double number2 = double.Parse(Console.ReadLine());
  62.             Console.WriteLine($"You chose: {number2}");
  63.  
  64.             Console.WriteLine("Choose your operator by number and hit enter:");
  65.             Console.WriteLine("> 1.) Addition");
  66.             Console.WriteLine("> 2.) Subtraction");
  67.             Console.WriteLine("> 3.) Multiplication");
  68.             Console.WriteLine("> 4.) Division");
  69.  
  70.             int op = 0;
  71.  
  72.             while (true)
  73.             {
  74.                 op = int.Parse(Console.ReadLine());
  75.                 Console.WriteLine($"You chose: {op}");
  76.  
  77.                 if (op < 1 || op > 4)
  78.                 {
  79.                     Console.WriteLine("Your input is invalid. Try again, with numerals 1 - 4.");
  80.                     continue;
  81.                 }
  82.  
  83.                 break;
  84.             }
  85.  
  86.             return new UserInputs() { Number1 = number1, Number2 = number2, Operator = op };
  87.         }
  88.  
  89.         public double Calculate(UserInputs userInputs)
  90.         {
  91.             double result = 0;
  92.  
  93.             switch (userInputs.Operator)
  94.             {
  95.                 case 1:
  96.                     result = Calculation.Addition(userInputs.Number1, userInputs.Number2);
  97.                     break;
  98.                 case 2:
  99.                     result = Calculation.Subtraction(userInputs.Number1, userInputs.Number2);
  100.                     break;
  101.                 case 3:
  102.                     result = Calculation.Multiplication(userInputs.Number1, userInputs.Number2);
  103.                     break;
  104.                 case 4:
  105.                     result = Calculation.Division(userInputs.Number1, userInputs.Number2);
  106.                     break;
  107.             }
  108.  
  109.             return result;
  110.         }
  111.  
  112.         public void OutputResult(double result)
  113.         {
  114.             Console.WriteLine($"Result: {result}");
  115.         }
  116.     }
  117. } 
  118.  
  119. // Calculation.cs
  120. namespace Calculator
  121. {
  122.     public static class Calculation
  123.     {
  124.         public static double Addition(double x, double y)
  125.         {
  126.             return x + y;
  127.         }
  128.  
  129.         public static double Subtraction(double x, double y)
  130.         {
  131.             return x - y;
  132.         }
  133.  
  134.         public static double Multiplication(double x, double y)
  135.         {
  136.             return x * y;
  137.         }
  138.  
  139.         public static double Division(double x, double y)
  140.         {
  141.             return x / y;
  142.         }
  143.     }
  144. } 
  145.  
Success #stdin #stdout 0.03s 25960KB
comments (?)
stdin
copy 
1.23
4.56
0
1
y
-1.23
-4.56
3
n
stdout
copy 
###############
Mini Calculator
###############

Please enter your first number: 
You chose: 1.23
Please enter your second number: 
You chose: 4.56
Choose your operator by number and hit enter:
> 1.) Addition
> 2.) Subtraction
> 3.) Multiplication
> 4.) Division
You chose: 0
Your input is invalid. Try again, with numerals 1 - 4.
You chose: 1
Result: 5.79
Do you like to solve another arithmetical problem? (y/n)
Please enter your first number: 
You chose: -1.23
Please enter your second number: 
You chose: -4.56
Choose your operator by number and hit enter:
> 1.) Addition
> 2.) Subtraction
> 3.) Multiplication
> 4.) Division
You chose: 3
Result: 5.6088
Do you like to solve another arithmetical problem? (y/n)

Press any key to exit...
https://ideone.com/SDzX1N
language:
C# (gmcs 5.20.1)
created:
2 years ago
visibility:
public

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